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<p>This study broadly investigates the influences of combined heat treatment and shot peening (HT + SP) on the microstructural development, surface quality, residual stresses, mechanical properties, and wear behaviour of LPBF manufactured Inconel 718. The HTed + SP significantly enhances the surface properties, reducing roughness and surface defects relative to the as-printed (AP) condition. Microstructural representation exhibited that AP samples showed distinct melt pool boundaries, columnar dendrites, Nb and Mo enriched interdendritic Laves phase, while HTed + SP samples resulted in superficial grain refinement, substantial plastic deformation, and even precipitation of γ′ and γ″ phases, beside with a shift of Nb into the γ matrix. In HTed + SP, EBSD analysis exhibited an enhancement in average grain size, an increase in HAGBs, and a reduction in KAM and GOS values, signifying improved recrystallization and lattice distortion. Post processing (PP) relieved tensile residual stresses in AP specimen into beneficial compressive stresses, improved hardness, and increased yield strength and UTS by 80% and 30%, respectively, amplified by a modest decrease in elongation. The improvement in wear performance caused from surface homogenisation, precipitation strengthening, and the existence of compressive residual stresses in the HTed + SP state. The results disclose strong relations between post processing, microstructural enrichment, residual stress alteration, and improved mechanical and tribological performance, offering a feasible technique for refining LPBF manufactured IN718 components for engineering applications.</p>

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Synergistic effects of shot peening and heat treatment on microstructure, grain refinement, wear resistance, residual stresses and mechanical property relationships in LPBF-fabricated inconel 718

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • M. D. Barath Kumar,
  • B. Elumalai,
  • S. Gnanavel,
  • S. S. Abienaw,
  • M. Hari Haran,
  • J. Harish Karthikeyan

摘要

This study broadly investigates the influences of combined heat treatment and shot peening (HT + SP) on the microstructural development, surface quality, residual stresses, mechanical properties, and wear behaviour of LPBF manufactured Inconel 718. The HTed + SP significantly enhances the surface properties, reducing roughness and surface defects relative to the as-printed (AP) condition. Microstructural representation exhibited that AP samples showed distinct melt pool boundaries, columnar dendrites, Nb and Mo enriched interdendritic Laves phase, while HTed + SP samples resulted in superficial grain refinement, substantial plastic deformation, and even precipitation of γ′ and γ″ phases, beside with a shift of Nb into the γ matrix. In HTed + SP, EBSD analysis exhibited an enhancement in average grain size, an increase in HAGBs, and a reduction in KAM and GOS values, signifying improved recrystallization and lattice distortion. Post processing (PP) relieved tensile residual stresses in AP specimen into beneficial compressive stresses, improved hardness, and increased yield strength and UTS by 80% and 30%, respectively, amplified by a modest decrease in elongation. The improvement in wear performance caused from surface homogenisation, precipitation strengthening, and the existence of compressive residual stresses in the HTed + SP state. The results disclose strong relations between post processing, microstructural enrichment, residual stress alteration, and improved mechanical and tribological performance, offering a feasible technique for refining LPBF manufactured IN718 components for engineering applications.